Container for packaging grinding wheels



g- 22, 1961 c. s. RUE, JR 2,997,164

CONTAINER FOR PACKAGING GRINDING WHEELS Filed Nov. 24, 1958 2 Sheets-Sheet 2 FIG. 6

INVENT OR.

1961 c. s. RUE, JR 2,997,164

CONTAINER FOR PACKAGING GRINDING WHEELS Filed Nov. 24, 1958 2 Sheets-Sheet l INVENTOR.

United S tates Patent 2,997,164 CGNTAINER FOR PACKAGING GRINDING WHEELS Charles S. Rue, Jr., Runnemede, N.J., assignor to West Virginia Pulp 8: Paper Company, New York, N.Y., a corporation of Delaware Filed Nov. 24, 1958, Ser. No. 776,118 4 Claims. (Cl. 20646) This invention relates to an improved holder or spacer or packaging relatively heavy objects of cylindrical shape, iarticularly grinding wheels and the like.

In packing grinding wheels and the like for shipment, t is of course desirable that each individual wheel be paced from its neighbors by cushioning means and that t also be supported against impact in radial directions.

The present invention contemplates a plurality of hold- :rs or spacers each of which is associated with one of a number of grinding wheels and each of which may be ormed from a single planar web or panel of paperboard raving as its outer boundary a perimeter no greater ban the cross section of the carton in which the assoiated grinding wheel and other grinding wheels are to we stacked. Thus, the holders or spacers contemplated y the invention are economical in terms of the amount f paperboard which they employ.

The invention contemplates holders or spacers each of vhich comprises a planar base against which one flat face if an associated grinding wheel may be positioned. The xlanar base has a marginal portion which is radially :xterior to the grinding wheel. Formed in this marginal portion of the planar base are a plurality of cutut planar flaps which hinge on the planar base and which :omprise cut-outs extending transversely inwardly from he perimeter of the marginal portion. The planar flaps are hinged to the marginal portion along radially exending hinge lines. The relationship is such that there s interference between the inner edges of the flaps and he cylindrical side of the grinding wheel, but the flaps nay be folded back onto the planar base to resiliently :ngage the cylindrical sides of the grinding wheel and mold it in spaced relationship from the carton walls, all IS more fully explained below.

These and other objects and advantages of the inention will become more fully apparent from the folowing description of a concrete example of the invenion and the accompanying drawings in which:

FIGURE 1 is a side elevation partially in cross section .howing a carton filled with grinding wheels and holders IS contemplated by the present invention.

FIGURE 2 is a plan view in cross section taken from he plane of the top face of one of the grinding wheels.

FIGURE 3 is a perspective view showing one of the iolders or spacers contemplated by the invention.

FIGURE 4 is a plan view of a blank from which the wider or spacer shown in FIGURE 3 is formed.

FIGURES 5-and 6 are diagrammatic illustrations exilaining the geometry of one aspect of the invention.

Shown in FIGURE 1 is a paperboard carton 10 havng side walls 11 and top flaps 12, 13 and 14. Positioned vithin the carton 10 is a stack of grinding wheels 15, inly one of which may be seen in FIGURE 2. The grinding wheels are of the conventional type having cyindrical peripheries or sides and having fiat faces transerse to their axes.

The gn'nding wheels normally have a relatively re- ;tricted central opening .16 to receive tool spindles or )ther mounting means. The area 17 in FIGURE 2 is ntended to illustrate the paper labels which are convenionally applied on the central portions of grinding wheel :aces.

The stacked grinding wheels are held in spaced IQQ relationship by the planar base panels or webs 20, several of which may be seen in FIGURE 1. Each of the planar bases 20 illustrated will be understood from FIGURES 2 and 4 to include a marginal portion radially exterior to their associated grinding wheel, that is, the grinding wheel located immediately above each of them as they are viewed in FIGURE 1. A plurality of cut-out planar flaps 23 are formed in the marginal portion of the planar base 20 and are hinged thereto along hinges or hinge connections 24, each of which extends outwardly in a radial direction away from the axis or center of the grinding wheel with which it is associated. Although the actual hinge connection is radially exterior of the associated grinding wheel, it will be understood that the term hinge line is intended to embrace imaginary inward extensions of the actual hinge connection, that is, the term hinge line is intended to be synonymous with the imaginary line around which each flap 23 moves in its hinged motion. The cut-out flaps 23 will be seen in FIGURE 4 to constitute flaps which extend transversely inwardly from the perimeter of the marginal portion of the associated planar web 20. In the operative position of the holder, the cut-out flaps 23 are folded back on the planar base 2% as perhaps shown most clearly in FIGURE 3. Since the inner edges 26 of each of the flaps 23 swings about its associated hinge line 24, there tends to be interference between the side wall of the associated grinding wheel and the inner edge 26 of each flap at positions where the flap is elevated above the plane of the associated planar base 20. If the inner edges 26 are somewhat relieved, there may still result a snug fit when the flaps are sufficiently elevated, and if they are not relieved, they may be slightly crushed or the associated flap 23 may be slightly twisted in order to accommodate the interference. This relationship tends to cause the flaps 23 to grip the associated grinding wheel, and each spacer and its associated grinding wheel tend to stay assembled in one for one relationship even when the grinding wheels are lifted from the package shown in FIGURE 1.

The corners of the blank from which the planar base members are cut may be relieved as at 29. Each planar base member 20 may have a central cut-out 28.

It will be understood that if the planar base member 26 is formed from a rectangular blank, such as that shown in FIGURE 4, then the outer edges 27' of the flaps 23 will be spaced from the side walls of the carton along at least most of their length When the flaps 23 are at angles other than parallel to their associated planar base Ztl. This relationship is illustrated in FIGURE 2. Nevertheless, transverse loads will be supported through the hinge connection of each flap 23 to its adjacent portion of the planar base 20 so that snug engagement of each flap 23 on its inner edge with its associated grinding wheel and engagement of the associated portion 30 of the planar base perimeter against the sides of the carton result in a resilient but sufficiently firm transverse support of the grinding wheels.

In general, the inner edges 26 of the flaps 23 are spaced a distance from the axis of the grinding wheel not less than the radius of the grinding wheel. in this connection it will be understood that a grinding wheel 15 placed on the blank shown in FIGURE 4 would lie approximately along the arcs of the slots defining the inner edges of the flaps 23. The inner edges of the flaps in the illustrated example of the invention are arcuate, but it will be understood that this is not always critical to the invention since the flaps may be notched in their inner sides or otherwise formed so that radially innermost points lying along an imaginary arc or the like may be provided. In any event, however, it is desirable that the radially innermost points of each flap 23 interfere with the sides of the associated grinding wheel when the flaps 23 are in partially elevated position, i.e., some position above that where they are coplanar with the associated planar base 20. To accomplish such interference these radially innermost points should be spaced a distance from the axis of the grinding wheel not so great as to be located further from an imaginary plane containing the axis of the grinding wheel and normal to the hinge line of the particular flap 23 than are the points on the upper edge of the grinding wheel which correspond (in distance from the hinge line) with the radially innermost points in question, and where there are no such corresponding points, a distance not so great as to be more than the radius of the grinding wheel.

This is diagrammatically illustrated in FIGURES 5 and 6. In FIGURE 5 one of the flaps 23 is shown having a hinge line 24, an inner limit 26A for the radially innermost points of its inner edge and an outer limit 263 for the radially innermost points of its inner edge. An imaginary plane PP contains the axis of the grinding wheel and is normal to hinge line 24. The inner limit 26A is determined by the radius R of the associated grinding wheel. The arcuate portion of the outer limit 26B is determined by the limitation that the points On the edge not be located further from the associated imaginary plane PP than are the points on the upper edge of the grinding wheel which correspond with the radially innermost points in their distance from the associated hinge line 24-. Thus, if the associated grinding wheel has a height H, then there 15 at least one point Y on the upper edge of the grinding wheel which corresponds to the point X in that it is equally distant from the associated hinge line 24, and it will be seen in FIGURE 5 that the point X is no further from the plane PP than is the point Y. The straight line portion of the outer limit 26B is that portion of the limit where there are no points on the upper edge of the grinding wheel corresponding in distance from the hinge line 24 with points on the innermost edge of the flap 23, since the inner edge points in question are spaced from the hinge line 24 a distance less than the thickness H of the grinding Wheel. Where there is no such correspondence, the edge portion 26B is located a distance from the plane PP not so great as to be more than the radius R of the grinding wheel.

In most instances it presently appears desirable that the inner edges 26 of the flap 23 approximate the inner limit 26A of the diagrammatical showing of FIGURE 5. In certain broad aspects of the invention, flaps may be provided which fall outside the inner and outer limits 26A and 26B as described above. However in one significant aspect of the invention, these limits are important because they eliminate such interference as would necessitate tearing or breaking of the side flaps 23 in order to raise them along the side of an associated grinding wheel, but they also establish an interference which will cause the side walls of the grinding wheel to be gripped by the flaps 23.

In the preferred example of the invention illustrated in FIGURES 1-4, the inner edges of the flaps 23 are coextensive with the peripheries of the associated grinding wheel 15 when the flaps are in the plane of the planar base 20, for example when the flaps are in their initial position in the blank as illustrated in FIGURE 4. If a grinding wheel is placed over the blank and the flaps 23 are then folded back on the planar base to the position illustrated in FIGURES 1-3, then the above-mentioned interference with the periphery of the grinding wheel necessitates the flap being somewhat sprung on its hinge line 24 and also some deforming of the inner edge 26 may occur. When the flap is in its folded back position, the natural spring of the paperboard tends to make it open, and the deforming of the inner edge 26 allows a certain degree of opening even through the inner edge 26 had initially been exactly coextensive with the periphery of the grinding wheel. Thus, for example, the flaps 23 may in this manner be allowed to open to the shallow angles illustrated in the drawings. If the paper were absolutely rigid and if there were no deforming of the coextensive edges 26, the flaps would be held back fiat on the planar base 20 due to the interference with the peripheries of the grinding wheel 15.

The above description of the invention should make it apparent that many details of the apparatus embodying the invention may be varied without departing from the teaching of the invention. Accordingly, the scope of the invention is not to be limited to precise details of the specifically described embodiments but is to be defined by the following claims.

What is claimed is:

l. A packaging assembly comprising a grinding wheel having a cylindrical periphery and flat faces transverse to its axis comprising a planar base against which one fiat face of said grinding wheel is positioned, said planar base having a marginal portion radially exterior to the grinding wheel, a plurality of cut-out planar flaps formed in said marginal portion and hinged thereto along hinge lines extending in a radial direction with respect to the grinding wheel, said flaps being folded back on said planar base, the inner edges of said flaps being engaged with said grinding wheel in said folded back position.

2. A packaging assembly comprising a grinding wheel having a cylindrical periphery and fiat faces transverse to its axis comprising a planar base against which one flat face of said grinding wheel is positioned, said planar base having a marginal portion radially exterior to the grinding wheel, a plurality of cut-out planar flaps formed in said marginal portion and hinged thereto along hinge lines extending outwardly in a radial direction with respect to the grinding wheel, the inner edges of said flaps being coextensive with the periphery of the grinding wheel when the flaps are in the plane of said planar base, the flaps being folded back on said planar base but not in the plane thereof.

3. A packaging assembly comprising a grinding wheel having a cylindrical periphery and fiat faces transverse to its axis comprising a planar base against which one flat face of said grinding wheel is positioned, said planar base having a marginal portion radially exterior to the grinding wheel, a plurality of cut-out planar flaps formed in said marginal portion and hinged thereto along hinge lines extending in a radial direction with respect to the grinding wheel, said flaps comprising cut-outs extending inwardly from the perimeter of said marginal portion, said flaps being folded back on said planar base, the inner edges of said flaps being engaged with said grinding wheel in said folded back position.

4. A packaging assembly comprising a grinding wheel having a cylindrical periphery and flat faces transverse to its axis comprising a planar base against which one fiat face of said grinding wheel is positioned, said planar base having a marginal portion radially exterior to the grinding wheel, a plurality of cut-out planar flaps formed in said marginal portion and hinged thereto along hinge lines extending outwardly in a radial direction with respect to the grinding wheel, said flaps comprising cut-outs extending inwardly from the perimeter of said marginal portion, the inner edges of said flaps being coextensive with the periphery of the grinding wheel when the flaps are in the plane of said planar base, the flaps being folded back on said planar base but not in the plane thereof.

References Cited in the file of this patent UNITED STATES PATENTS 1,156,074 Hahn Oct. 12, 1915 1,282,656 Tiede Oct. 22, 1918 2,598,192 Poust May 27, 1952 2,765,907 Dunning et a1. Oct. 9, 1956 

